devel June 2021

devel@uclibc-ng.org

3 participants
2 discussions

[sparc] revert of gcc patch for sparc for build with fPIE
by Romain Naour 06 Jun '21

06 Jun '21

Hello, Since Buildroot 2021.02 [1] an upstream gcc commit is reverted to allow booting the qemu_sparc_ss10_defconfig. The revert must be applied for gcc 8.4, 9.3 and 10.2 and any newer version. upstream gcc commit: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=0a83f1a441d7aaadecb368c237b6e… The commit has been introduced to fix the following bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92095 The regression has been reported to gcc [2] but the gcc change may affect the ldso code or how the GOT register is handled with fPIC in uClibc-ng. This part of the code seems fPIC friendly, it can be worse with the new default BR2_PIC_PIE option. So I would drop the sparc support while adding gcc 11 to avoid carrying non upstream patch forever in gcc package. There is no problem for the sparc64 with a glibc toolchain (sparc64 for uClibc-ng is not currently available in Buildroot) Help welcome. Best regards, Romain [1] https://git.buildroot.net/buildroot/commit/?id=4d16e6f5324f0285f51bfbb5a350… [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98784

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[PATCH 0/1] V4 fix powerpc PIE/PIC + secure-plt builds
by Yann Sionneau 04 Jun '21

04 Jun '21

This is the 4th iteration of the patch. Changes wrt v3: * add #ifdef __PIC__ test in ldso startup code, to be sure, even though I'm pretty sure this piece of code is always built as PIC. Changes wrt v2: * more precise description of the problem. * only set r30 in PIC+secureplt case as it seems indeed to be the only case which causes problem. Secureplt without PIC does not need r30. * don't rely on uclibc being already built: now we check for secure-plt by doing $(CC) --verbose and searching for the ./configure parameters of GCC for "--enable-secureplt". Yann Sionneau (1): powerpc: fix PIE/PIC builds with newer gcc/binutils which use secureplt by default Rules.mak | 3 ++- ldso/ldso/powerpc/dl-startup.h | 3 +++ libc/sysdeps/linux/powerpc/crt1.S | 4 ++++ 3 files changed, 9 insertions(+), 1 deletion(-) -- 2.25.1

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devel June 2021